One of the best investments that I made at the beginning of the year was an inexpensive self-inking date stamper. All good early childhood teachers know the importance of dating absolutely everything children produce - but I got sick of writing the date on 50 art works everyday.
More than once sometimes, just for the fun of it :)
I got mine from Office Works for about $18. I got the idea from a blog I read ages ago, but have no memory of which blog it was - sorry I can't give credit where it is due!